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4.0L OHV & SOHC V6 Tech General discussion of 4.0L OHV and SOHC V6 Ford Ranger engines.

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Old 03-26-2007
Thread Starter
Join Date: Nov 2006
Location: Corona, CA
Posts: 4
Icon9 Chronic chugging!

98 4.0L that constantly runs horrible anf gets horrible gas mileage... the check engine light is on and when I check the code it says "system to lean" "bank 1" "bank 2" "cylinder four not firing"....I have replaced the oxygen sensors, all 3, replaced the MAS and spark plugs/wires... but the problem persist...what is going on?
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Old 03-26-2007
Join Date: Aug 2005
Location: Haverhill, MA
Posts: 1,907
did u gap the plugs right? and running a can of sea foam why not.

i'm sure someone will know of some other things to try
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Old 03-26-2007
Join Date: Feb 2005
Location: Canton, GA
Posts: 33
I have my own theory on this... and did a google search on this, as I have been having a similar problem and had those codes a while back...

I have also heard of a fuel pump that has/is going bad causing this problem.... might be worth checking into... I'm gonna try it later next week after I get moved into my new house... If you get to it before I do, lemme know how it goes.
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Old 03-26-2007
zabeard's Avatar
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fuel filter? fuel injectors?

run some fuel cleaner through it.

check spark plug gap and check to make sure the spark plug wires are connected well
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Old 03-26-2007
BBBB51's Avatar
Join Date: Oct 2006
Location: Alb. N.M.
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I was getting this code when I had a bad maf,system to lean" "bank 1" "bank 2. Went to the junkyard got 1 and it went away . Was the 1 u got new.
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Old 03-27-2007
wydopnthrtl's Avatar
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Unplug the MAF and trying driving it. The PCM will go to a default setting.. but if that's the problem it ought to run better.

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Old 03-28-2007
Thread Starter
Join Date: Nov 2006
Location: Corona, CA
Posts: 4
thank you all. the MAS was new; however I am going to start with the fuel pump and then get a fuel injector cleaning done. I am curious about the sea foam and will look into it. again thanks...Rangers Rule!
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Old 03-28-2007
Roach2004's Avatar
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Location: Houston, TX
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I am sorry for whoring the thread but every time I read the title I think of alcohol! That is all
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